731.1
PBG
CH-SG
CH-SG
Art. 109 Planungs- und Baugesetz (PBG) - Bestandesgarantie a) Umbauten und Erweiterungen
B. Nutzungs- und Bauvorschriften - II. Erstellung von Bauten und Anlagen - 10. Ausnahmebewilligung und Bestandesgarantie
Art. 109 PBG · Bestandesgarantie a) Umbauten und Erweiterungen
1. Bestand und Erneuerung von formell rechtmässig erstellten Bauten und Anlagen, die den geltenden Vorschriften oder Plänen widersprechen, sind gewährleistet.
2. Umbauten, Zweckänderungen und Erweiterungen sind zulässig, soweit dadurch die Rechtswidrigkeit weder vermehrt noch wesentlich verstärkt wird. Keine Verstärkung der Rechtswidrigkeit liegt vor, wenn Bauten und Anlagen ohne Vergrösserung des umbauten Raums umgebaut oder in ihrem Zweck geändert werden, sowie beim Anbringen einer Wärme- und Schalldämmung.
3. Vorbehalten bleiben Anpassungs- und Sanierungspflichten nach besonderen Vorschriften.
Gerichtsentscheide zu dieser Bestimmung (33)
B.2024.44 · sg (Art. 109 Abs. 2 PBG)
Appeal Against Building Permit Cancellation Regarding Forest Setback Violation
The appeal was dismissed because the building project was deemed to go beyond a mere 'extension' allowed under the vested rights guarantee (Bestandesgarantie) of this provision.
23.669 · sg (Art. 109 Abs. 2 PBG)
Appeal Regarding Building Permit for Roof Structure Reinforcing Setback Violations
This provision establishes that the extension of a non-compliant building is only permitted if it does not substantially reinforce the illegality, which was the main ground for upholding the appeal and revoking the building permit.
23.669 · sg (Art. 109 PBG)
Appeal Regarding Building Permit for Roof Structure Reinforcing Setback Violations
The appeal was granted because the building project was deemed incompatible with this provision, leading to the revocation of the permit.
23.6201 · sg (Art. 109 PBG)
Appeal Regarding Building Permit for Roof Addition and Parking Due to Significant Strengthening of Existing Forest Setback Violations
The appeal was granted because the planned project leads to a significant reinforcement of the existing illegality, making approval under this provision impossible.
B.2023.22 · sg (Art. 109 Abs. 1 in Verbindung mit Abs. 2 Satz 1 PBG)
Appeal Against Building Permit Extension for Showroom Events Dismissed Over Noise Concerns
Cited implicitly in the reasoning regarding whether the expansion significantly reinforced an existing illegality related to parking and access, which is a core aspect of the decision.
B.2023.22 · sg (Art. 109 Abs. 1 in Verbindung mit Abs. 2 Satz 1 PBG)
Appeal Against Building Permit for Showroom Extension Dismissed
Cited in the introductory summary as relevant to the assessment of whether the extension significantly reinforced an existing non-conformity, which supported the decision to dismiss the appeal.
B.2023.68 · sg (Art. 109 Abs. 2 PBG)
Cellular Antenna Permit Denial Upheld Due to Unlawful Base Structure
The appeal was rejected because the planned construction (mobile facility) significantly reinforced the existing unlawfulness, as determined under this provision.
B.2023.68 · sg (Art. 109 Abs. 2 PBG)
Cellular Facility Permit Denial Upheld Due to Material Zoning Illegality of Existing Structure
The appeal was dismissed because the planned mobile facility would significantly intensify the existing illegality of the structure, as assessed under this provision.
22.5875 · sg (Art. 109 PBG)
Retaining Wall Height Extension Appeal Denial
The refusal of the building permit for the increase in the retaining wall was based on the finding that it constituted a substantial reinforcement of the illegality, as analyzed under this provision concerning existing guarantees.
20.4347 · sg (Art. 109 PBG)
Antenna Permit Cancellation Due to Unlawful Pre-existing Structure Intensification
The appeal was granted and the building permit was revoked because the planned extension (cell tower) constituted a substantial reinforcement of the existing illegality, violating this article.
22.756 · sg (Art. 109 PBG)
Administrative Appeal Dismissed: Mobile Phone Antenna Permit Upheld Despite Formal Deficiencies
Cited in the reasoning for dismissing the appeal regarding the vested rights (Bestandesgarantie) of existing, non-conforming constructions.
22.1107 · sg (Art. 109 PBG)
Appeal Dismissed Over Untimely View Obstruction Claim and Permitted Dormer Addition
The final order implies that the projected dormers are covered by the existing rights and expansion guarantee, which is based on this article.
B.2021.170 · sg (Art. 109 Abs. 1 und Abs. 2 Satz 1 PBG)
Building Permit Extension and Intensification of Setback Violation
This provision governed the admissibility of extensions to formally lawful buildings, which was the central legal question leading to the dismissal of the appeal.
B.2021.170 · sg (Art. 109 Abs. 1 und Abs. 2 Satz 1 PBG)
Building Permit Overturned for Extension Increasing Existing Setback Violation
This provision defines the conditions under which enlargements of formally lawful buildings are permissible, which was the core legal question addressed in concluding the appeal was dismissed.
B.2021.147 · sg (Art. 109 PBG)
Building Permit Denial Upheld Due to Aggravation of Existing Setback Violation
The appeal was dismissed because the planned extension constituted a substantial reinforcement of the existing illegality regarding the setback distance, meaning it was not covered by the grandfathering guarantee.